Welp, I think night->day transition would take a few seconds more than on PC, and the visible screen portion would be reduced, but otherwise it would be portable
I think there would be hiccups on old3DS in some places, but since I have an old3DS, I would optimize the soul out of it
Since this is not a fast-action game, I wouldn't need some crazy collision detection, so it should be doable

Welp, I think night->day transition would take a few seconds more than on PC, and the visible screen portion would be reduced, but otherwise it would be portable
I think there would be hiccups on old3DS in some places, but since I have an old3DS, I would optimize the soul out of it
Since this is not a fast-action game, I wouldn't need some crazy collision detection, so it should be doable

I could look up what the game is and some footage and relate it back to the 3ds hardware, however the first step is to ask whether the game has any source code available or if someone else has already reverse engineered it (think something like freeciv or openttd) or otherwise remade it (something like VCMI which is looking to remake heroes of might and magic 3). Seen as this is a game less than a month old then I doubt this has happened.

If you lack such a thing then consider it a no to anybody putting in the effort for the 3ds.

If you want to play it on your 3DS then you are probably better off making some kind of VNC program for it and playing it there. If as MarcusD said it is not a fast paced game then the lag and fiddly nature of such things would be as big a barrier as something that does need real time/fast paced input.